Overbed table and connecting linkage therefor



Sept. 29, 1959 J. SCHLACKMAN ETA]. OVERBED TABLE AND CONNECTING LINKAGETHEREFOR FileduJan. 31, 1958 2 Sheets-Sheet 1 INVENTORS; LAC KMAN BENOITJOSEPH SCH ROLAND A.

p 1959 J. SCHLACKMAN ETAL 2,906,575

OVERBED TABLE AND CONNECTING LINKAGE'THEREFOR Filed Jan. 31, 1958 2Sheets-Sheet 2 70 INVENTORS: 75 :5; JOSEPH SCHLACKMAN i 77 52 ROLAND A.BENorr g} BY 31 Q 67 m M 10 J 5 54 65' United States Patent Ofifice 72,906,575 Patented Sept. 29, 1959 OVERBED TABLE AND CONNECTING LINKAGETHEREFOR Joseph Schlackman, Brooklyn, N.Y., and Roland A. Benoit,Dayville, Conn, assignors to Royal Metal Manufacturing Company, NewYork, N.Y., a corporation of Illinois Application January 31, 1958,Serial No. 712,436 6 Claims. (Cl. 311-38) This invention relates to anew and improved tiltingtop table construction and to a connectinglinkage suitable for use in a table of this kind.

In some applications, it is highly desirable to employ a table having atop which may be conveniently maintained in any one of a number ofangular positions with respect to the base of the table. A particularexample of a table of this kind is an over bed table, utilized inhospitals and otherwise in the care of bed patients, having a tablesurface which may be elevated at an angle with respect to the table baseto afford a convenient reading angle for the patient and for otherpurposes. Accordingly, the invention is described hereinafter inconnection with a table of this kind, although it should be understoodthat it may also be applicable to other types of tables which requiretilting of the table top to one or a series of stable positions.

In over bed tables, and in other applications as well, the table topshould preferably be readily and conveniently movable to any of itsangular positions without requiring the use or" tools or other devicesand without requiring substantial effort on the part of the table user.This is particularly important in tables which are to be utilized by bedpatients, since in many instances the patients may be in generallyweakened condition and may be able to exert only a minimum effort inadjusting the table. Consequently, the connecting linkage whichdetermines the elevation angle of the table top should be extremelysimple and convenient in operation and should provide for manipulationwithout the use of special tools, adjusting handles, or the like.

A primary object of the invention, therefore, is a new and improvedtilting-top table which is simple and convenient in operation and whichrequires a minimum effort for adjustment to a number of dilferentangular positions.

A more specific object of the invention is a new and improvedtilting-top table which may be actuated by one hand to a number ofdifferent stable positions.

A further object of the invention is a new and improved connectinglinkage for a tilting-top table or like device which aifords a positivelatching action to maintain a table top or like member in any one of aplurality of different positions.

Another object of the invention is a new and improved connecting linkagefor a tilting-top table or like device which is simple and economical inconstruction and which skilled in the art without departing from thepresent invention.

In the drawings:

Fig. 1 is a perspective view of an over bed table and is utilized toillustrate a typical application of the invention;

Fig. 2 is a sectional view of the top portion of the table of Fig. 1taken along line 2-2 therein;

Fig. 3 is a detail view of a hinge construction employed in the over bedtable;

Fig. 4 is a detail view of another hinge structure which may be utilizedin the over bed table;

Fig. 5 is a sectional view of the table, taken as indicated by line 55in Fig. 2 but with the top of the table in elevated position;

Fig. 6 is a sectional view taken along line 6-6 in Fig. 5;

Fig. 7 is an enlarged sectional view of a connecting linkage employed inthe table of Figs. 1-6;

Fig. 8 is a detail view showing the connecting linkage of Fig. 7 in adifferent operating position;

Fig. 9 is an additional detail view illustrating another operatingposition for the connecting linkage; and

Fig. 10 is an enlarged sectional view of the connecting linkage takenalong line 10-10 in Fig. 7.

The over bed table 20 illustrated in Fig. 1 is in many respectsconventional in construction and includes a table support or standard 21comprising a cross brace 22 to which there are affixed a pair of legmembers 23 and 24. Suitable casters 25 and 26 are mounted upon the legmembers 23 and 24 respectively and afiord a floor-engaging support forthe standard 21. The standard or support structure of the table furtherincludes an upright member 27 which is mounted upon and projectsupwardly from the center portion of the leg member 24 and which isutilized to support, in cantilever fashion, a table base member 28. Inmany applications, it may be necessary to raise or lower the table basemember 28 with respect tothe floor or other surface upon which the tableis supported in order to accommodate the table to use with beds ofvarying height. Accordingly, a suitable elevating mechanism may bemounted within the upright member 27 and utilized to mount the basemember 28 upon the table standard 21. This elevating mechanism, whichmay be controlled by an operating handle 29, may be of conventionalconstruction; inasmuch as the elevating mechanism does not constitute apart of the present invention,

aifords relatively long operating life with a minimum of no particularmechanical arrangement for this portion of the table is illustrated.

The over bed table 20 further includes a fixed table top member 30 whichis mounted upon the base member 28 and which constitutes a rigid part ofthe table structure; In addition, the over bed table is provided with asecond table top member 31 which is pivotally mounted upon the basemember 28. The table top member 31, as more fully described hereinafter,is adapted to be moved from a corner position in which it is alignedwith the fixed table top 30 to anyone of a plurality of tilted positionswhich the top member 31 is angularly displacedfrom its normal position.

The over bed table 20, as thus far described, may be substantiallyconventional in construction and in use. Thus, in operation, the tableis disposed in alignment with a bed or couch, the base member 28projecting over'the top of the bed to afford ready access to a patientor other person in the bed. The lower portion of the table standard 21,comprising the cross member 22 and the leg member 23, projectsunderneath the bed, the upright member 27 being located immediatelyalongside the bed. With the top member 31 in its normal position,aligned with the fixed top 30, the table may be used for eating or forlarly in Figs. 2, and 6, the base member other purposes requiring asubstantially horizontal table surface. On the other hand, the topmember 31 may be tilted to any one of a number of angular positions forgreater convenience of-the patient in reading or other occupations, asdescribed more fully hereinafter.

In general, the mounting of the tilting table top member 31 upon thetable base member 28 is best illustrated in Figs. 26. As indicated inthese figures, and particu- 28 of the table is provided with a pair offixed frame members 32 which extend across the base member 28; theseframe members 32 are rigidly secured to the base member 23 by suitablemeans such as bolts or, preferably, by welding. An auxiliary sheet metalframe member 33 is mounted on two frame members 32 and secured theretoby suitable means such as by spot welding, riveting, or like knowntechniques. This auxiliary frame member 33 affords a depression orpocket within which a wash basin or pan 34 may be disposed.

The tilting table top structure of the over bed table 20 furtherincludes a support member 36. In the illustrated construction, thesupport member 36 comprises a generally rectangular frame which ishinged to the table base member 28 by a pair of hinges 38. One of thesehinges is illustrated in Fig. 4; as shown therein, it comprises a firsthinge plate 39 which is secured to the base member 28 as by a pluralityof bolts 40 or other like fastening means. A second hinge plate 41 issuitably fastened to the frame member 36 by suitable means; in thisinstance, the hinge plate 41 may be mounted upon the frame member 36 byspot welding as indicated by reference numeral 42. The two hinge plates39 and 41 each engage a hinge pin 43, thereby affording a convenient andeffective pivotal mounting for the support member 36 with respect tobase member 28. As indicated in Figs. 2 and 4, when the hinges 38 areclosed, the support member 36 is disposed within the confines of thebase member 28 with the support member resting upon the upper. surfaceof the auxiliary frame member 33.

The table top 31, on the other hand, is pivotally mounted upon thesupport member 36 by a pair of hinges 45, the pivotal connection betweenthe table top and the support member 36 being at the opposite side ofthe table from the hinges 38 connecting the support member and the tablebase 28. Fig. 3 affords a detailed illustration of the hingeconstruction utilized in mounting the table top member upon the supportmember; as indicated therein, each of the hinges 45 may include a firsthinge plate 46 which is spot welded or otherwise secured to the supportmember 36. A second hinge plate 47 is suitably afiixed to the table topmember 31, the two hinge plates being bent to embrace a hinge pin 48. Inthis instance, the two hinge plates extend substantially parallel toeach other when the hinge is in its closed position as contrasted withthe right angle relationship of the hinge plates in the hinges 38 whenthe latterare closed. In this manner, the table top member 31 is spaceda relatively short distance above the support member 36 and, when thetable top member is disposed in its horizontal or closed position, itrests upon a plurality of brackets 50 aflixed to the table base member28. Preferably, the brackets 50 are provided with rubber cushions orlike devices for engaging the undersurface of the table top 31. Ifdesired, a spring latch or other latch device 49 may be used to hold thetable top member 31 in alignment with the support member 36.

The table 20 is also provided with two connecting linkages 52 and 53.The connecting linkage 53 interconnects the support member 36 with oneof the frame members 32 of the table base 28. This connecting linkage isutilized to maintain the support member 36 and table top 31 in any oneof a series of angularly displaced positions with respect to the basemember 28, as illustrated in Fig. 6. The other connecting linkage 52extends between the table top member 31 and the support member 36 and isutilized to maintain the table top member in any one of may be securedto the channel a plurality of tilted positions with respect to thesupport member 36 and the base member 28 as indicated in Fig. 2. The twoconnecting linkages 52 and 53 are of substantially similar construction;accordingly, only the linkage 52 is described in detail hereinafter inconnection with Figs. 7-10.

The connecting linkage 52 illustrated in Figs. 7-10 comprises anelongated channel 54 which, as illustrated in Fig. 10, is approximatelyU-shaped in cross sectional configuration. At one end, the channel isbent inwardly to form a pair of end wall sections 55A and 558 which areseparated by a gap 56. A hinge 57 is mounted on the opposite end of thechannel 54, being affixed to an extension portion 58 of one side wall ofthe channel. The hinge 57 may be extremely simple in construction andextension 58 by a rivet 59 which also constitutes the pivot pin of thehinge.

The connecting linkage 52 further includes an elongated link 69; on oneend 61 of the link 60 there is mounted a hinge 62 which may besubstantially similar to the hinge 57 and which may be convenientlysecured to the link end 61 by means of a rivet 63 which also comprisesthe pivot pin of the hinge. The opposite or free end 64 of the elongatedlink 60 extends through the opening 56 into the channel 54. This freeend 64 of the link 60 has secured to it a pair of latch elements 65 and66 which normally extend outwardly from the link into engagement withthe opposed side walls 67 and 68, respectively, of the channel 54. Theresilient latch elements 65 and 66 preferably comprise simple leafsprings and may be secured to the link 60 by any suitable means such asa rivet 69.

A retainer member 70 is included within the linkage 52; this retainermember is substantially U-shaped in cross sectional configuration asbest indicated in Fig. 10 and 1s disposed in encompassing relation tothe link 60 intermediate the resilient latch elements 65 and 66 and theend walls 55A, 55B of the channel 54. The 1'51 tainer member 70 ispreferably made substantially smaller in its cross sectional dimensionsthan the channel 54 In order that the retainer member may be freelyslidable within the channel. Moreover, the retainer member is relativelyshort in length as compared to the link 60 and the channel 54. Movementof the retainer member within the channel is restricted by limit meanscomprising a first lug 71 which is mounted at the end of the channel 54opposite the walls 55A, 55B and a pair of additional lugs 72 which aremounted within the channel 54 immediately adjacent the end walls 55A,553. In addition, a series of shoulders are provided along the twoopposed side walls 67 and 68 of the channel 54. In the illustratedembodiment, the shoulder means comprises a plurality of shoulderelements 77 spot welded or otherwise suitably affixed to the channelwall 67 at spaced intervals therealong; a similar series of shoulderelements 78 are secured to the wall 68 of the channel 54. A secondchannel member or cover 80 is disposed in encompassing relation to thechannel 54 to prevent displacement of the link 60 from within thechannel 54 and also to prevent excessive dirt or other foreign matterfrom accumulating in the connecting linkage. Preferably, the cover 80 iscrimped or otherwise aflixed to the channel 54 and the end portion 81 ofthe cover may be bent to afford an enclosing end wall at the hinge endof the channel 54.

When the connecting linkage 52 is installed in the table 20, the hinge57 is afiixed to one of the support and table top members 36 and 31respectively. In the illustrated embodiment, for example, the hinge 57may be affixed to the underside of the table top member 31; thus the endof the channel 54 comprising the wall sections 55A and 55B constitutesthe free end of the connecting linkage channel. The hinge 62, on theother hand, is secured to the other of the support and table top membersand in this instance is suitably mounted upon the support member 36.Thus, it is seen that the free end 64 of the link 60 extends into thefree end of the channel 54. Moreover, the connecting linkage is mountedupon the support and table top members with the link 60 extended to itsmaximum extent into the channel 54, as illustrated in Fig. 9 and isexplained more fully hereinafter.

Starting from the normal position shown in Fig. 9, the link 60 slideswithin the channel 54 in the direction indicated by arrow A as the tabletop 31 is tilted upwardly to the position 31A shown in Fig. 2. Theposition 31A of the table top member corresponds generally to thelinkage position illustrated in Fig. 6, in which the resilient latchelements 65 and 66 engage the shoulder elements 77A and 78A to preventmovement of the link 60 back into the channel 54, thereby preventingreturn movement of the table top to its normal or horizontal position.The table top remains in the intermediate stable position 31A as long asdesired and will support a substantial weight;

Subsequently, it may be desired to return the table top 31A to itsinitial position. For this purpose, the table top member is elevated tothe limit position indicated by phantom outline 318 in Fig. 2. When thisis done, the elongated link 60 is substantially fully withdrawn from thechannel 54 to the position shown in Fig, 8. As the link 60 is withdrawnfrom the channel 54, it moves the retainer member 70 toward the rearwall 55A, 55B of the channel 54 until the retainer member encounters thelimit means comprising the two lugs 72. The lugs interrupt movement ofthe retainer but do not immediately prevent continued movement of thelink 60. As a consequence, the continuing movement of the link 60 bringsthe resilient latch elements 65 and 66 into engagement with the retainermember 70, the latch elements being drawn into the retainer element in amanner such that they are effectively disengaged from the side walls ofthe channel 54. The resilient nature of the leaf springs 65 and 66causes them to engage the retainer member 70 firmly, with the resultthat the link 60 can be moved in a direction opposite arrow A toward thenormal position illustrated in Fig. 9 without encountering anyinterference between the resilient latch elements 65 and 66 and theshoulder elements 77 and 78., Thus, from the limit position 31B, thetable top member 31 is freely pivotally movable back to the normalposition shown in solid outline in Fig. 2.

As the table top member is returned to its normal or horizontalposition, the link 60 is of course moved inwardly of the channel 54.Moreover, the retainer element 70 is constrained to move along with thelink 60, being gripped by the two resilient latch elements 65 and 66.When the retainer element 70 reaches the position shown in Fig. 9,however, it engages the additional limit means comprising the lug 71.Lug 71, like the lugs 72, interrupts movement of the retainer memberwithout interfering with continued movement of the link 60.Consequently, the final movement of the table top member 31 to itsnormal position effectively shifts the link 60 relative to the retainermember 70 and frees the retainer member from its engagement with theresilient latching elements 65 and 66. Thus, return of the table topmember 31 to its normal or starting position effectively conditions theconnecting linkage 52 for further use of the latching elements 65 and 66in retaining the linkage in any of the intermediate positions defined bythe shoulder elements 77 and 78.

In those applications in which-the table is required to support asubstantial weight or may otherwise be loaded in a manner which imposesa substantial stress upon the connecting linkage 52, the use of duallatch elements such as the elements 65 and 66 is desirable in that itaifords substantial weight-bearing capacity. 0n the other hand, in manyapplications, including the over bedtable 20, the load requirements onthe table maybe relatively light. Under these circumstances, it is not;

necessary to utilize both of the latching elements 65 and 66 to retainthe connecting linkage in any of its intermediate positions. Rather, theshoulder elements along one wall of the channel 54 may be eliminatedentirely, in which case the shoulder elements on the other wall maycarry the entire load. By the same token, one of the spring members 65and 66 may also be omit ted, provided some other bearing element issecured to the free end of the connecting link 60 to maintain the linkin the desired alignment within the channel 54. These relatively minormodifications of thelinkage require only the omission of parts and andare well within the skill of an ordinary mechanic; accordingly, theyhave not been illustrated in the drawings. It will of course beunderstood that it is not necessary that separate sheet metal or othershoulder'elements 77 or 78 be utilized in constructing the connectinglinkage; rather, the shoulders necessary to operation of the device maybe formed by punching out sections of the side walls of the channel 54or by other suitable structural ex-' pedients.

The second connecting linkage 53 is substantially similar inconstruction to the connecting linkage 52 and extends between thesupport member 36 and the'table base 28. In the arrangement illustratedin Fig. 6, the link member of the connecting linkage 53 corresponds tothe link 60 of the device 52 and is secured at its hinged end to theframe member 32 of the table base 28. The channel member 91 of thelinkage 53, on the other hand, is affixed at its hinged end to thesupport member 36. Operation of the connecting linkage 53, whichestablishes a series of stable intermediate positions for the supportmember 36 with respect to thebase member 28, is substantially asdescribed hereinabove in connection with the linkage 52. Thus, the tabletop member 31 and the support member 36 form a first pivotal unit, themembers of which are interconnected by the linkage 52, whereas thesupport member 36 and the table base member 28 form a second pivotalunit interconnected by the linkage 53, the operation of the two pivotalunits being essentially similar to each other. In the bed table 20, ofcourse, the pivotal unit comprising the table top member 31A and thesupport member 36 may be actuated to any of several stable operatingpositions to alford a tilted table surface for the patient, whereas thepivotal unit comprising the support member 36 and the base member 28 maybe actuated to one of a series of tilted positions to provide access tothe basin 34.

The construction of the connecting linkages of the invention isextremely simple and economical, since virtually all of the parts may bestamped from relatively light weight sheet metal stock. The linkages areparticularly well adapted to a totally enclosed construction, makingthem relatively simple and convenient to clean and preventingaccumulation of foreign material in the linkages, which might interferewith their-operation. The effort required to actuate the linkages isextremelysmall and they may be controlled completely without recourse toseparate tools, operating handles, or the like.

While preferred embodiments of the invention have been described andillustrated, it is to be understood that these are capable of variationand modification. Accordingly, the aim in the appended claims is tocover all such variations and modifications as may fall within the truespirit and scope of the inventio We claim:

1. In a table of the kind including a support member and a table topmember mounted for pivotal movement between a normal position adjacentsaid support member and a limit position angularly displaced from saidsupport member, a connecting linkage comprising: an elongated channelhingedly connected at one end to a first one of said support and tabletop members; an elongated link, hingedly connected at one end to theother ofsaid support and table top members and having a free endextending into the free end of said channel for longitudinal slidingmovement therein between a normal position in which a substantialportion of said link is dis posed within said channel and a limitposition substantially withdrawn from said channel; a resilient latchelement, affixed to said link and normally extending therefrom intoengagement with one wall of said channel; a retainer member, disposedwithin said channel for sliding movement therein, for engaging saidlatch element to deflect said latch element from engagement with saidwall of said channel whenever said link is moved to its limit positionand releasable from said latch element by movement of said link to itsnormal position; and means affording at least one shoulder along saidwall of said channel for engaging said latch element to prevent movementof said link toward its normal position when said retainer is disengagedfrom said latch element.

2. In a table of the kind including a support member and a table topmember mounted for pivotal movement between a normal position adjacentsaid support member and a limit position angularly displaced from saidsupport member, a connecting linkage comprising: an elongated channelhingedly connected at one end to a first one of said support and tabletop members; an elongated link, hingedly connected at one end to theother of said support and table top members and having a free endextending into the free end of said channel for longitudinal slidingmovement therein between anormal position in which a substantial portionof said link is disposed within said channel and a limit positionsubstantially withdrawn from said channel; a resilient latch element,afiixed to said link and normally extending therefrom into engagementwith one wall of said channel; a retainer member, disposed within saidchannel for sliding movement therein in response to movement of saidlink, for releasably engaging said latch element to deflect said latchelement from engagement with said wall of said channel; limit means,mounted within said channel, for effectively moving said retainer memberrelative to said link to engage said retainer with said latch elementwhenever said link is moved to its limit position and to release saidretainer member from said latch element whenever said link is moved toits normal position; and means affording at least one shoulder alongsaid wall of said channel for engaging said latch element to preventmovement of said link toward its normal position when said retainer isdisengaged from said latch element.

3. In a table of the kind including a support member and a table topmember mounted for pivotal movement between a normal position adjacentsaid support member and a limit position angularly displaced from saidsupport member, a connecting linkage comprising: an elongatedsubstantially completely enclosed channel hingedly connected at one endto a first one of said support and table top members; an elongated link,hingedly connected at one end to the other of said support and table topmembers and having a free end extending into the free end of saidchannel for longitudinal sliding movement therein between a normalposition in which a substantial portion of said link is disposed withinsaid channel and a limit position substantially withdrawn from saidchannel; a pair of resilient latch elements, each comprising a leafspring affixed to said link, said latch elements normally extending fromsaid link into engagement with opposed walls of said channel; a retainermember, disposed within said channel for sliding movement therein, forengaging said latch elements to deflect said latch elements fromengagement with said wall of said channel whenever said link is moved toits limit position and releasable from said latch elements by movementof said link to its normal position; and means affording a plurality ofshoulders along one of said walls of said channel for engaging thecorresponding one of said latch elements to prevent movement of saidlink toward its nor- 8 m al position when said retainer is disengagedfrom said latch elements thereby affording a corresponding pluralityofstable angular positions for said table top member relative to saidsupport member.

4. In a table of the kind including a support member and a table mountedfor pivotal movement between a normal position adjacent said supportmember and a limit position angularly displaced from said supportmember, a connecting linkage comprising: an elongated substantiallycompletely enclosed channel hingedly connected at one end to a first oneof said support and table top members; an elongated link, hingedlyconnected at one end to the other of said support and table top membersand having a free end extending into the free end of said channel forlongitudinal sliding movement therein between a normal position in whicha substantial portion of said link is disposed within said channel and alimit position substantially withdrawn from said channel; a resilientlatch element, comprising a leaf spring affixed to said link adjacentthe free end thereof and normally extending therefrom into engagementwith one Wall of said channel; a retainer member, disposed within saidchannel for sliding movement therein in response to movement of saidlink, for releasably engaging said latch element to deflect said latchelement from engagement with said wall of said channel; a first lug,mounted within said channel adjacent the free end thereof, for blockingmovement of said retainer member as said link nears said limit positionto effectively move said retainer member relative to said link andengage said retainer member with said latch element whenever said linkis vmoved to its limit position; a second lug, mounted within thechannel adjacent the hinged end thereof, for blocking movement of saidretainer member as said link nears said normal position to effectivelymove said retainer member relative to said link and release saidretainer member from said latch element whenever said link is moved toits normal position; and means affording at least one shoulder alongsaid wall of said channel for engaging said latch element to preventmovement of said link toward its normal position when said retainer isdisengaged from said latch element.

5. A unidirectional multi-position connecting linkage comprising: anelongated channel; an elongated link, having one end extending into agiven end of said channel for longitudinal sliding movement thereinbetween a normal position in which a substantial portion of said link isdisposed within said channel and a limit position substantiallywithdrawn from said channel; a pair of resilient leaf spring latchelements, affixed tosaid link adjacent said one end thereof and normallyextending therefrom into engagement with opposed walls of said channel;a substantially U-shaped retainer member, disposed within said channelfor sliding movement therein, for engaging said latch elements todeflect said latch elements from engagement with said walls of saidchannel whenever said link is moved to its limit position and releasablefrom said latch elements by movement of said link to its normalposition; and means affording a plurality of shoulders along at leastone of said walls of said channel for engaging said latch elements toprevent movement of said link toward its normal position from any one ofa series of intermediate positions when said retainer is disengaged fromsaid latch elements.

6. A unidirectional multi-position connecting linkage comprising: anelongated channel; an elongated link, having one end extending into agiven end of said channel for longitudinal sliding movement thereinbetween a normal position in which a substantial portion of said link isdisposed within said channel and a limit position substantiallywithdrawn from said channel; a resilient latch element, affixed to saidlink and normally extending therefrom into engagement with one wall ofsaid channel; a retainer member, disposed within said channel forsliding movement therein in response to movement of said link, forreleasably engaging said latch element to deflect said latch elementfrom engagement with said wall of said channel; lug means, disposedwithin the opposite ends of said channel, for engaging said retainermember to effectively move said retainer member relative to said linkand engage said retainer member with said latch element whenever saidlink is moved to its limit position and release said retainer memberfrom said latch element whenever said link is moved to its normalposition; and means affording at least one shoulder along said wall ofsaid channel for engaging said latch element to prevent movement of saidlink toward its normal position when said retainer is disengaged fromsaid length element.

264,049 Tucker Sept. 5, 1882 1,893,552 King Jan. 10, 1933 2,252,215Stearns Aug. 12, 1941 2,685,486 Woller Aug. 3, 1954 2,742,336 HolmbergApr. 17, 1956 2,775,781 Morgan Jan. 1, 1957

